In a press briefing Tuesday night, Austin Police Department Assistant Chief Ely Reyes said a Goodwill employee sorting through recent donations found two “artillery simulators," one of which "initiated" in the employee's hand, which caused his injuries. The employee was treated at St. David's South Austin Medical Center and has been released, Reyes said.

Reyes also said authorities have no reason to believe the incident is the work of a copycat of the perpetrator of a series of bombings in Central Texas.

Earlier Tuesday, a bomb exploded inside a package destined for Austin in a FedEx facility in Schertz, outside San Antonio, causing no injuries. Another bomb was found at a separate FedEx facility but didn't explode.

And on Tuesday afternoon in Sunset Valley — a town contained within Austin's city limits — authorities issued a public notice that the FBI was investigating "a confirmed link between packages involved in the Austin bombing investigation and a mail delivery office in Sunset Valley." FedEx said in a statement that it had turned over to authorities "extensive evidence" related to the packages and the person who mailed them.

In a statement Tuesday evening, Special Agent Michelle Lee with the FBI's San Antonio field office confirmed a connection between the two packages found at FedEx locations Tuesday and the four previous package explosions that occurred in Austin.

"We do believe that these incidents are all related. That is because of the specific contents of these devices," said Brian Manley, Austin's interim police chief, according to media accounts.

In all, the explosions have left two dead and several others injured.

Officials are offering a $115,000 award for information that leads to the arrest of the person or people responsible. Gov. Greg Abbott also released $265,500 in emergency funding on Monday for Austin police to buy seven bomb-detecting x-ray systems.

“I want to ensure everyone in the Austin region and the entire state that Texas is committed to providing every resource necessary to make sure these crimes are solved as quickly as possible,” Abbott said in a statement.

Quality journalism doesn't come free

Perhaps it goes without saying — but producing quality journalism isn't cheap. At a time when newsroom resources and revenue across the country are declining, The Texas Tribune remains committed to sustaining our mission: creating a more engaged and informed Texas with every story we cover, every event we convene and every newsletter we send. As a nonprofit newsroom, we rely on members to help keep our stories free and our events open to the public. Do you value our journalism? Show us with your support.